From owner-freebsd-hackers@FreeBSD.ORG  Tue Feb 22 13:17:49 2011
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Date: Tue, 22 Feb 2011 14:17:46 +0100
From: Damien Fleuriot <ml@my.gd>
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Subject: Re: LAGG - interface comes up but no laggports
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On 2/22/11 1:18 PM, Bernhard Schmidt wrote:
> On Tuesday, February 22, 2011 12:31:34 Damien Fleuriot wrote:
>> rc.conf
>> ---
>> # LINK AGGREG
>> ifconfig_lagg0="laggproto failover laggport em0 laggport em1"
>> ipv4_addrs_lagg0="192.168.1.3/29"
>> ifconfig_lagg0="inet6 fe80::3/64"
> 
> You are overwriting the variable, you have to use some alternative or 
> move everything into one statement.
> 


Good  call, it now works correctly:
lagg0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 9014
        options=19b<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,VLAN_HWCSUM,TSO4>
        ether 00:15:17:37:17:e6
        inet6 fe80::215:17ff:fe37:17e6%lagg0 prefixlen 64 scopeid 0x5
        inet 192.168.1.3 netmask 0xfffffff8 broadcast 192.168.1.7
        nd6 options=3<PERFORMNUD,ACCEPT_RTADV>
        media: Ethernet autoselect
        status: active
        laggproto failover
        laggport: em1 flags=0<>
        laggport: em0 flags=5<MASTER,ACTIVE>


You'll notice that using ipv6_addrs didn't work, as the interface is
using an automatic address instead of fe80::3/64 which I tried to set.

I suppose I could use the crontab for this, @reboot ifconfig lagg0 inet6
fe80::3/64 , or perhaps rc.local



Thanks for the help everyone, this was becoming frustrating.